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What is the correct order of decreasing ...

What is the correct order of decreasing stability of the following cationas ?
`underset(I)overset(o+)(CH_(3)-CH-CH_(3))" "underset(II)overset(o+" ")(CH_(3)-CH-OCH_(3))" "underset(III)overset(o+" ")(CH_(3)-CH-CH_(2)-OCH_(3))`

A

`IIgtIgtIII`

B

`IIgtIIIgtI`

C

`IIIgtIgtII`

D

`IgtIIgtIII`

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The correct Answer is:
A
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